Just after a little advice from others who might have more experience of social services and what they do..
Have been pushing the doctor and hv for more help with pnd (dc2 is 3 mo). I had severe pnd with dc1 and since previous history of depression. Anyway i told the doctor that i have good days and bad days and on my bad days i get so angry i feel like throwing baby across the room. I don't feel i would do anything in actuality but don't know what's going to happen tomorrow or the next day. For weeks despite me saying this and asking for referral for talking therapy they both just say they will meet to chat with me and suggested support group but they won't get me talking therapy because ive had some in the past and they don't think more would be any use. 
Anyway doctor has eventually taken me seriously today cos she rang to tell me she's calling social services "to see if they can support me further".
I wonder whether i should have just kept my mouth shut about my anger towards baby because so far i haven't thought there was any possibility i would hurt baby. but i was frustrated the hv and gp didn't seem to take me at all seriously so thought i should be honest about all my feelings. 
Does anyone have any idea what will happen next? What is the process with ss? I am worried about telling my husband that he will think ive just stirred up trouble for no reason (ie i haven't got any treatment from the gp except anti depressants).
Thanks 